CaCO3 -> CO2 -> CO -> C -> CH4 -> CH3Br -> CH2Br2​

Question

CaCO3 -> CO2 -> CO -> C -> CH4 -> CH3Br -> CH2Br2​

Answer 1

CaCO3=CaO+CO2

2CO2=2CO+O2

2CO=2C+O2

C+2H2=CH4

CH4+Br2=CH3Br+HBr

CH3Br+Br2=CH2Br2+HBr